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CIECAM02 ModelForward conversion equations Input data:
If data on Categorical viewing conditions settings for the model
Surround type may be defined via such a relationship:
The value The cone responses are:
here
The degree of viewers adaptation:
The adaptation transform is:
The transformation to Hunt-Pointer-Estevez cone responses is conducted as follows
The nonlinear response compression transform is:
If any of values of Opponent axes:
Hue angle:
Eccentricity factor:
Color quadrature
using the values of unique hues shown in Table below. Here Unique hue data for the calculation of hue quadrature
The achromatic response is:
The lightness is:
The brightness is:
The chroma is:
here
The colorfulness is:
The saturation is:
CIECAM02 includes three attributes in relation to the chromatic content: chroma (C), colorfulness (M) and saturation (s). These attributes together with lightness (J) and hue angle (h) can form three colour spaces
CIECAM02 CIECAM02 Inverse conversion equations First its necessary to compute surround-dependent parameters and achromatic response for reference white
The chroma is:
If starting from lightness, the brightness can be calculated:
If saturation is known the chroma is defined as follows:
If hue quadrature data is available the hue angle can be calculated using unique hue data for the calculation of hue quadrature as:
here
The eccentricity factor is:
The achromatic response is:
The following relationships are used for obtaining
if
if
The cone responses are:
If any of the values of
Tristimulus values of the sample then are:
Date: 2014-12-22; view: 2561
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